[linux-audio-dev] GTK performance?

Steve Harris S.W.Harris at ecs.soton.ac.uk
Thu Apr 28 10:14:08 UTC 2005

On Thu, Apr 28, 2005 at 11:45:57 +0200, Jens M Andreasen wrote:
> Hi all!
> The other day I dressed up my application with a fancy g5-ish pixmap
> theme. Looks good and expensive :) 
> As it turned out, it really was expensive (counting cpu-clocks.)

Unless you have an ultra-bleeding edge X setup a lot of the work of the
pixmap drawing is done by the CPU, thats quite a lot of maths. There is
some new tech which uses OpenGL to do the X drawing, which moves a lot of
the load off to the graphics card, but its not really available yet.

This /really/ helps, for e.g. I have a beta version of meterbridge that
can use OpenGL or SDL (X) pixmaps, on my thinkpad (which has a comparitivly
hardcore graphics chip, but its only a laptop) I can fill the screen with
32 scaled VU meters at about 3% CPU load, with SDL it maxes out the CPU
when I have about half that number of unscaled meters (the SDL code doesnt
do scaling, its too expensive).

- Steve 

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